Bulletin, Issues 95-98 (Google eBook)

Front Cover
U.S. Government Printing Office, 1920 - Mines and mineral resources
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Page 360 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.
Page 471 - Ike current is directly proportional to the electromotive force and inversely proportional to the resistance.
Page 298 - Gas-House Coal Tar. Coal tar produced in gas-house retorts in the manufacture of illuminating gas from bituminous coal.
Page 14 - Acre-foot (AC-FT, acre-ft) is the quantity of water required to cover 1 acre to a depth of 1 foot and is equivalent to 43,560 cubic feet or about 326,000 gallons or 1,233 cubic meters.
Page 529 - Polymeric. Having the same elements united in the same proportions by weight, but with different molecular weights. (Webster) Polymerize. To change into another substance having the same elements in the same proportions, but a higher molecular weight. (Webster) Polymnite.
Page 515 - A special type of vise usually attached to work bench. It is frequently made with three serrated jaws, one of which moves between the other two and may be forced against the pipe by screw or toggle. At times made with an open or latching side to permit rapid work.
Page 211 - Any change in the original shape of rock masses. Folding and faulting are common modes of deformation. (Ransome) Degradation. The general lowering of the surface of the land by erosive processes, especially by the removal of material through erosion and transportation by flowing water. (La Forge) Degrade. To wear down by erosion. (Webster) Degree. A division, space, or interval marked on a mathematical or other instrument, as on a thermometer. (Webster) Degree of curve. In railroad surveying, that...
Page 212 - The ratio of the mass of any volume of a substance to the mass of an equal volume of some standard substance. For liquids and solids the standard substance Is water.
Page 499 - Penetration Method.! The method of constructing a bituminous macadam pavement by pouring or grouting the bituminous material into the upper course of the road metal before the binding of the latter has been completed.
Page 64 - Fe)PO,+2H,O, found in spheroidal concentration. (Standard) Barrel. 1. The water-cylinder of a pump. 2. A piece of small pipe inserted in the end of a cartridge to carry the squib to the powder. 3. A vessel used in amalgamation. (Raymond) 4. The body of a windlass or a capstan about which the cable winds. (Webster) Barrel amalgamation. See Barrel process. Barrel chlorination. See Barrel process. Barrel copper. Native copper occurring in small masses, separated easily from the matrix and shipped in...

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